@book{fhs,
author={Rusty Russell and Daniel Quinlan and Christopher Yeoh},
title={Filesystem Hierarchy Standard},
publisher={Filesystem Hierarchy Standard Group},
year={2004},
url={http://www.pathname.com/fhs/}
}
@book{bach,
 author = {Bach, Maurice J.},
 title = {The design of the UNIX operating system},
 year = {1986},
 isbn = {0-13-201799-7},
 publisher = {Prentice-Hall, Inc.},
 address = {Upper Saddle River, NJ, USA},
 }
@misc{xv6,
author={Kaashoek, Frans and Morris, Robert and Russ Cox},
title={The {\tt XV6} Source Code},
howpublished={Online},
url={http://pdos.csail.mit.edu/6.828/2008/src/xv6-rev2.tar.gz},
Edition={Second}
}